That model TA valve body is NOT a full manual, it's a "manual/automatic" that still requires using the kickdown linkage.
If you're looking for a TA forward-pattern
manual vb, the older and current model #s are as follows:
17675 - CHEETAH Pro Street Valve Body - PRN321 Stock Pattern, Manual Only (Pro Street and Competition Use) --> Low Band Apply
17680 - CHEETAH Manual SP Valve Body - PRN321 Stock Pattern (Competition Drag Strip Use Only) --> No LBA
17875XA - CHEETAH XtremeAction Pro Street Valve Body - PRN321 Stock Pattern, Manual Only --> Low Band Apply
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https://www.turboaction.com/17875XA%206-04-18.pdfThe 17875XA also has the same
"If your Low/Reverse rear servo has a heavy aftermarket spring you must change it back to a stock return spring. If you do not use a stock rear servo spring you will burn up the rear band." warning, which I asked about on here last year.